I would recommend not only to search Google patents, but also to try
the European patent office via
http://gb.espacenet.com/search97cgi/s97_cgi.exe?Action=FormGen&Template=gb/EN/home.hts
and also to try the German patent office via
https://dpinfo.dpma.de/index_e.html
There are quite some misspellings in all the databases, mostly in
Google. I always found additional material this way.
Kind regards from the hometown of Welte.
Gerhard Dangel
Augustinermuseum, Freiburg, Germany
http://www.museen.freiburg.de/
http://www.welte-mignon.de/
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